angeles police department or the los angeles airport police. any report that these posts may have been abandoned, i find unusual. i never traveled through once and they were unposted. >> the suspect, quiet, a loner, what are the warning signs someone might do something like this? >> being quiet and a loner probably describes 50% of the american population so you can't take those traits and make them predictive. the warning behaviors are much more specific and one of the most compelling warning behaviors is leakage. that's when the shooter tells somebody either directly or indirectly what they are planning to do. there's two things to keep in mind here. the motivation for these types of crimes occur months, if not years before the event. the thinking about it, putting the thoughts together that they don't like this part of the government, part of a conspiracy. the triggering events occur sooner to the event or not too long before the event occurs. that's where you see the warning behaviors is around the time of the triggering events. that's what